A native species at risk of becoming Threatened; does not qualify as Endangered or Threatened, but have been determined to require some measure of protection or attention to ensure that the species does not become threatened. NYSDEC may regulate the taking, importation, transportation, or possession of any Species of Special Concern as it deems necessary.

Federal Protection:
Not Listed

State Rarity Rank:S1

A State Rarity Rank of S1 means: Typically 5 or fewer occurrences, very few remaining individuals, acres, or miles of stream, or some factor of its biology makes it especially vulnerable in New York State.

Global Rarity Rank:G5

A Global Rarity Rank of G5 means: Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.

Did you know?
Snails in this family possess a unique gill that protrudes outside the mantle facilitating the tolerance of low dissolved oxygen concentrations.

It seems clear that the southern range margin of this boreal snail is retreating northward through New York, and that it has apparently gone missing from many of the smaller lakes where it was historically found around the state (Jokinen 1992). However, because it can live in the bottom sediments of larger lakes such as Oneida and Ontario, it will be difficult to assess its overall status. At this time, it does not appear to be one of the most imperiled freshwater Gastropods in New York and the S1 rank could be altered pending further survey work.

Recently (2012), a large population was discovered in Oneida Lake, and a smaller one in Cayuga Lake was re-confirmed as extant. The Oneida Lake population has apparently been known at least since the mid 1800s.